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Mad Enhancement (狂化, Kyōka?, localized as "Blind Rage"EX and "Madness Enhancement"GO) is the Class Skill that characterizes a Berserker, raising basic parameters and strengthens one's physical abilities in exchange of hindering mental capacities and/or in exchange for their sense of reason. In some cases, it also affects and/or seals away some techniques, Personal Skills and Noble Phantasms.

Rank User(s)
EX Heracles Ichor
Jeanne d'Arc Alter (Swimsuit)
「Manga? Me? What stupid things are you saying? Did a worm hatch in your brains?」 「Of course it’s wrong, this won’t beat that dōjin…!」

「I’m going to draw, with all my body and soul…!」

Arjuna (Alter)
In order to begin a new era, Arjuna Alter is determined to sever all evil. As a result, he has almost lost his humanity. By changing his Saint Graph, his Mad Enhancement fluctuates too.
Caenis
As the hero of tyranny, Caenis exhibits a unique form of Mad Enhancement. Normally, they have the capacity for reasoning. However, when their anger accumulates to a specific threshold, it triggers a frenzy during which any possibility of mutual understanding becomes entirely impossible. During this frenzy, there is a potential risk that they may actively attempt to harm the Master, which could result in the termination of their manifestation.
Florence Nightingale
Nightingale communicates in a composed manner, but establishing mutual understanding can be challenging as she predominantly engages in self-dialogue.[1] Her primary focus lies in tending to the sick and injured. To persuade her, one must demonstrate that a proposition contributes to the betterment of others' health and well-being.
Florence Nightingale (Santa)
It's unclear whether this happened because the qualities of her original Berserker Spirit Origin were retained, or if it was that the hero Nightingale's characteristics remained. She may be more mild-mannered in her speech than she was as a Berserker, but her conversational style hasn't really changed much.
Galatea
Because she was carved out of a single minded love that was equal to madness that could turn a statue into a human being by PygmalionWP, Galatea inhereted that madness.
Gilles de Rais (Saber)
Because it is a very special summon and because Gilles de Rais is much more famously known as the name Bluebeard, even Saber will be given the Mad Enhancement Skill.
Kiyohime
Communication is perfectly possible with Kiyohime, but she will treat her Master as a lover and prohibits them from lying. If her Master lies and Kiyohime sees through it, one Command Spell is automatically consumed.[2]
Kiyohime (Swimsuit)
Kiyohime's infatuation with her Master is central to her character, so she retains Mad Enhancement even as a Lancer.
Kriemhild
Despite being a Berserker, Kriemhild is blessed with intellect and cunning.
Minamoto-no-Raikou
Raikou retains her original intellectual capacity and does not experience a loss of reason. However, she exhibits an intense maternal affection to the extent that she becomes possessive of those she cares for. This fixation leads her to disregard societal norms and resort to extreme measures to protect and support those in her care. Although she is mentally unwell, both Raikou and those around her may not fully comprehend the depth of her condition. Persuading her to change her behavior proves to be an insurmountable challenge.[3]
Miyamoto Musashi (Swimsuit)
Because of the summer, Musashi has become very strange.
Penthesilea
Normally, it is possible to come to a mutual understanding with Penthesilea. However, her ability to reason will disappear when confronting Achilles. Even when facing other Greek heroes, she loses some degree of reason. Being called beautiful is also traumatic to her, and might cause lose her rationality aswell.[4]
Spartacus
Even when under Mad Enhancement, Spartacus is able to hold a conversation, despite this he is fixated on always making the most difficult choice, so essentially, a mutual understanding with him is impossible.[5] He is also solely focused on rebelling against oppression.
Vlad III (Berserker)
Although under the influence of Mad Enhancement, Vlad's thinking is decent and not even his wish for the Holy Grail has changed. That said, the fact that he accepted the features of a vampire is unprecedented for him.[6]
Miyamoto Musashi (Berserker)
This skill is acquired upon manifestation and results in a minor enhancement of certain attributes. While communication remains feasible, making rational decisions necessitates a Luck check
Ushi Gozen (Rider), Ushi Gozen (Avenger)
In concert with Divine Manifestation, she can continuously hide this skill from even her Master. Increases some parameters. Rational conversation is seemingly possible, but reaching a mutual understanding is extremely difficult. In Class Rider, not even the combined power of three Command Spellswere capable of stopping her rampage.
EX (C) Cú Chulainn (Alter)
Because he is a Berserker born through a desire wished upon the Holy Grail, Cú Chulainn Alter is capable of reasoning, although Mad Enhancement bonuses are actually equivalent to Rank C. However, it is impossible for him to talk with an adversary, as regardless of what was said he simply push forward towards his purpose.[7]
A+ Barghest (Lostbelt)
Barghest displays no apparent mental abnormalities. However, she experiences a recurring, undisclosed compulsion, the nature of which remains unknown. When subjected to this unidentified impulse, she succumbs to madness, transforming into a Berserker who engages in indiscriminate violence, unless promptly resolved.
Caligula
Only Caligula's mission to expand the Roman Empire and make it prosper is not lost from his mind. Thanks to this, if an ally approaches him citing Rome, a Luck Check occurs, and if successful, he restrains his rampage. If the ally has ties with Rome, the check will be easier, meaning it will be easier for him to restrain himself. However, such restraint only stops his rampage and does not make it possible for properly communicate with him.[8]
Kingprotea
Protea, as a giant whose existence poses a threat to the world regardless of her rapport with humans, finds it impossible to align her values with those of humans on a fundamental level. This means that Protea perceives herself as not being large or powerful, but she considers the world and her surroundings to be small and weak in comparison to her. It is a way of viewing her own size and strength in a relative context, downplaying her own significance and emphasizing the insignificance of her surroundings.
A Henry Jekyll and Hyde (Assassin), Huwawa, Samson
Rank up for all parameters, but most of one's reason is robbed.[9]
Artoria Caster (Swimsuit)
Artoria Caster is very peaceful and A・A is a mass of rationality, yet she possesses a Madness Enhancement skill of high ranking.While it may be a baffling story, I hope you can tell how abnormal this situation is from the fact that A・A, the supposed mass of rationality, goes and abandons her professional duties because - and I quote - "It's Summer".

As for Artoria Caster, she officially acquired the skill upon reaching her second ascension.[10]

Kijyo Koyo
Kijyo can communicate her feelings to her Master through telepathy. She is gentle despite high ranking Mad Enhancement.
Lu Bu
Due to undergoing consciousness equalization with Rani VIII, Lu Bu has become a more mechanical Servant.[9]
B Asterios, Darius III, Eric Bloodaxe, Ibaraki-douji, Megalos, Morgan (Lostbelt)
Rank up for all parameters, but takes away most of sanity.[11]
Heracles (Berserker)
Heracles beat his harp instructor to death when he was a child, and had many episodes when he killed people in his rage without even hearing them speak. For Heracles, the Berserker class was an easy class to adapt to.[11]
B- Dioscuri
A skill possessed by the sister, Pollux. Mutual communication is possible, but the parameter-increasing effect has been limited. However, if her brother is severely wounded, she will fly into a frenzy and be almost impossible to communicate with, becoming the very incarnation of aggression.
C Lancelot (Berserker), Mysterious Idol X Alter
Rank up for all parameters except Luck and Mana, but in exchange, one can no longer think and speak properly.[12]
Arcueid Brunestud
In Arcueid's case, Mad Enhancement does not function properly due to a misunderstanding from her Master, Monji Gatoh. Her original Rank in this Skill is A.[9]
Barghest (Swimsuit)
Forming the UDk and becoming its leader, Barghest's predatory impulses have been curbed. Her two pledges to protect the animals inhabiting the forest and to act as a servant of the hotel as well as manage it seems to have suited Barghest's personality surprisingly well.[13]
Jack the Ripper (Assassin)
When "this version" of Jack the Ripper is summoned as a Berserker, she is only active at night, with The Mist always being active, and will attack anything that possesses mana.[14]
Minamoto-no-Raikou (Swimsuit)
Although even as a Lancer where she still will lose all reason at a certain point, there is a comparatively large difference as when she is a Berserker as she now has a sense of morality. However, as she is indifferent to her own scantily clad appearance, it seems that the traces of mental degradation can't be fully cleared away.[15]
Mysterious Heroine X (Alter)
Apart from her imposed mission, her "Berserkerness" is now fading away.[16]
Mysterious Heroine XX (Alter)
No information available.
Oda Nobunaga (Swimsuit)
Nobu is the same as usual so the presence of Mad Enhancement is not too noticeable. According to the Servant herself, it feels like her mind that preferrs quiet tea ceremonies is running wild.[17]
Tamamo Cat
It is hard to say that Tamamo Cat is under the effects of Mad Enhancement because she already has a weak reasoning skills to begin with. Although sometimes Tamamo Cat mutters words with implications that can surprise the surrounding people.[18]
C- Salome
Communication is possible with Salome, but she as a Servant has a constantly broken spirit. Even if she appears conversational on the surface, one must remain wary.
D+ Nagakura Shinpachi
Hijikata Toshizou
Hijikata is driven by intense self-confidence that spurs his insanity. He believes that as long as he remains, the ShinsengumiWP shall never die.[19]
D Frankenstein, Mori Nagayoshi, Sei Shounagon (Swimsuit)
Strength and Endurance parameters are up. Language ability is simple. Continuing complex thoughts over long periods of time are difficult.[5]
Ibaraki-douji (Swimsuit)
Mad Enchancement still remains with Ibaraki-douji even though her Saint Graph had changed. However, because it could combine with the characteristics of oni-kind, its power is exceptionally controllable. Her reasoning is still intact, and she can calm down and have a normal conversation.
Paul Bunyan
In Bunyan's case, instead of her reason being affected, she is unable to recall whether she is spoken of as a man or woman in the legends.[20]
D- Mutual understanding is possible at this rank.
Brynhildr (Swimsuit)
E+ Chacha
Normally, Chacha doesn't receive the effects of Mad Enhancement. In exchange, she keeps her normal ability to think. However, regarding matters related to her child, any control will be lost.[21]
E~A++ Ragnar Lodbrok
This Skill is fluctuating in accordance with Viðurr Berserk. While the Noble Phantasm is unreleased, he's capable of proper verbal communication, but this Skill becomes its E-Rank equivalent
E Frankenstein (Swimsuit)
Talking is still troublesome for Fran, but easier than when she was in the Berserker-class.[22]
Ibuki-douji (Swimsuit)
Perhaps due to using Sakata Kintoki as a model for how to be a Berserker, who has a low rank in Mad Enhancement himself, Ibuki-douji has a low rank in this skill.
Jaguar Man
Even though she thinks she can comprehend conversations, in reality, Jaguar Man often does not even understand them.[14]
Nitocris Alter
Nitocris Alter does hold madness within her, but possesses more than enough reason to carry through with the same kind of premeditated crimes as the ones from her legend. This Skill causes no defect in her ability to reason or communicate, and the effect it has on her stats is extremely minimal.

Ordinarily this is the Class Skill of Berserkers. Heroic Spirit Nitocris is an avenger without vengefulness, and would ordinarily never be summoned as a genuine Avenger. However, if for some peculiar reason there was a situation in which she was established with an Alter Saint Graph, Nitocris would be able to be summoned as a unique Avenger possessing the Class Skills of a Berserker, but only then.[23]

Sakata Kintoki
Whenever Kintoki receives damage, a Luck Check fires. If it results in failure, he goes wild, all parameters except Mana and Luck are raised, and his whole body becomes red.[14]
Tomoe Gozen
Though Gozen maintains her normal capacity to think, she does not benefit from a status increase.[24]
E- Beowulf
The user does not receive the benefits of Mad Enhancement nor do they lose any of their reasoning abilities, and overall they just become a little rougher.[25]
Beowulf has this rank of Mad Enhancement because, while he is linked to historical berserkers, he had never lost his sanity in his life.[25]
Duryodhana
Elizabeth Báthory (Berserker)
As Elizabeth is still possesses her reasoning abilities, the benefits from this Skill are very low. Rather than affecting her abilities or endurance, it's simply made so that she does not feel pain.[9]
Magni
Due to the teachings of Thor, Magni finds the idea of retreat unforgivable and has a negative modifier applied to his evasion. If he were to take nine steps backwards in the midst of battle, his madness will bolster by one rank.
Jack the Ripper (Berserker)
Because Jack's fundamental attribute is madness, an inversion occurred and this Skill was sealed. That seal, however, is extremely unstable.[26]
? Henry Jekyll and Hyde (Berserker), Chevalier d'Eon, Martha, Vlad III (Apocrypha), Carmilla, Atalanta, Nikola Tesla
  1. Fate/Grand Order material III — Profile of Florence Nightingale, translated by ComunCoutinho at Reddit.
  2. Fate/Grand Order material II — Profile of Kiyohime, translated by King of Padoru at Beast's Lair.
  3. Fate/Grand Order material IV — Profile of Minamoto-no-Raikou, translated by Clyton at Beast's Lair.
  4. Fate/Grand Order material V — Profile of Penthesilea, translated by castor212 at Beast's Lair.
  5. 5.0 5.1 Fate/Apocrypha material
  6. Fate/Grand Order material I & II: section on Saber Lily, Cú Chulainn (Proto), Stheno, Carmilla, Vlad III and Diarmuid Skills, translated by Master of Chaos at Beast's Lair (post does not contain a comprehensive translation of all Skills of the mentioned Servants).
  7. Fate/Grand Order material III — Profile of Cú Chulainn (Alter), translated by King of Padoru at Beast's Lair.
  8. Fate/Grand Order material II — Profile of Caligula, translated by Kinalvin at Reddit.
  9. 9.0 9.1 9.2 9.3 Fate/EXTRA material
  10. Profile of Artoria Caster (Swimsuit), translated by Konchew at Reddit.
  11. 11.0 11.1 Fate/complete material III
  12. Fate/Zero material
  13. — Profile of Barghest (Swimsuit), translated by Konchew at Reddit.
  14. 14.0 14.1 14.2 Fate/complete material IV
  15. Fate/Grand Order material V — Profile of Minamoto-no-Raikou (Swimsuit), translated by Clyton at Beast's Lair.
  16. Fate/Grand Order material V — Profile of Mysterious Heroine X (Alter), translated by King of Padoru at Beast's Lair.
  17. Fate/Grand Order material V — Profile of Oda Nobunaga (Swimsuit), translated by Konchew at Reddit.
  18. Fate/Grand Order material II — Profile of Tamamo Cat, translated by WaifuHunter at Reddit.
  19. Fate/Grand Order material V: Emiya Alter, Hessian Lobo, Yan Qing, Hijikata Toshizou, Wu Zetian, Christopher Columbus, Paul Bunyan and Parvati. Translated by castor212, Beast's Lair.
  20. Fate/Grand Order material V — Profile of Paul Bunyan.
  21. Fate/Grand Order material V — Profile of Chacha, translated by King of Padoru at Beast's Lair.
  22. Fate/Grand Order material V — Profile of Frankenstein (Swimsuit), translated by King of Padoru at Beast's Lair.
  23. — Profile of Nitocris Alter, translated by Petrikow at Beast's Lair.
  24. Fate/Grand Order material VI
  25. 25.0 25.1 Fate/Grand Order material III — Profile of Beowulf, translated by Kinalvin at Reddit.
  26. Fate/strange Fake Light Novel — Volume 4, Profile(s) of Jack the Ripper (Berserker) and François Prelati, translated by You at Beast's Lair.

Quick Answers

How does Mad Enhancement affect a Berserker's abilities? toggle section
Mad Enhancement, or "Madness Enhancement," is a Class Skill for Berserkers that boosts physical abilities and basic parameters but reduces mental capacities, affecting speech and thought. It can also impact or seal techniques, Personal Skills, and Noble Phantasms. For example, Magic Resistance is lowered, while Protection of the Fairies boosts Luck in battles.
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How does Mad Enhancement impact Noble Phantasms? toggle section
Mad Enhancement affects Noble Phantasms by possibly sealing or altering them. It is a Berserker Class Skill that boosts physical abilities while impairing mental capacity. This can hinder the proper use of techniques or Noble Phantasms. For example, Herakles' Noble Phantasm, God Hand, is influenced by his Divinity, which is impacted by Mad Enhancement.
Provided by: Fandom
What is the origin of Mad Enhancement in Fate lore? toggle section
Mad Enhancement is a Class Skill in Fate lore, defining the Berserker class. It boosts a Servant's attributes beyond their original Heroic Spirit's capabilities, sacrificing sanity. This skill enhances physical abilities but impairs mental faculties, sometimes affecting techniques and Noble Phantasms. Initially, it was used to strengthen weak Heroic Spirits.
Provided by: Fandom
What are the trade-offs of using Mad Enhancement? toggle section
Mad Enhancement is a Berserker Class Skill that increases physical abilities by enhancing basic parameters. This boost comes at the expense of mental capacities, impairing reasoning. It can also affect or seal techniques, Personal Skills, and Noble Phantasms.
Provided by: Fandom
What is the significance of Mad Enhancement in the Fate series? toggle section
In the Fate series, Mad Enhancement is a Class Skill for Berserkers. It boosts a Servant's abilities beyond their original Heroic Spirit level, sacrificing sanity for increased power. This skill enhances physical strength and basic parameters but impairs mental faculties, sometimes affecting Personal Skills and Noble Phantasms. Initially, it was used to empower weaker Heroic Spirits.
Provided by: Fandom

Variation[]

Servant Skills
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